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Ivahew [28]
3 years ago
12

Based on the passage, if the influenza virus pictured had a mutated hemagglutinin protein, urumin would most likely A) still be

very effective against it. B) be somewhat effective against it. C) be ineffective against it. D) harm the host instead of the virus.
English
1 answer:
andrezito [222]3 years ago
8 0

Answer:

Viruses are prone to clumping together. Many times extensive sequence changes may not make a difference in antibody recognition. While sometimes small changes in HA are sufficient for a large antigenic distance. That is, with few mutations, some Hemagglutinins may be much less recognized by the antibodies.

Explanation:

As the virus replicates in the body of infected people, the immune system captures several pieces of viral protein, the antigenic antibodies, and produces antibodies against them. There are other types of immune responses, too, but they do not cause long-term immunity, so that is beside the point. The two main viral targets of the antibodies are Hemagglutinin and Neuraminidase, since they are the most exposed proteins of the virus. When antibodies associate with them, in addition to signaling macrophages and other types of defense cells that that foreign body (the virus) has to be attacked, they can still prevent the virus from working. An antibody that attacks the Hemagglutinin receptor recognition region prevents it from associating with cells. They are the so-called neutralizing antibodies.

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Present simple and continuous
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Answer:

1. I (are, <u>am</u><u>)</u> happy.

2. All my friends (<u>like</u>, likes) football.

3. My sister (don't like, <u>doesn't like</u>) school.

4. (<u>Is</u>, Are) a farmer's life stressful?

5. My parents (<u>don't listen to</u>, doesn't listen to) rock music.

Present continuous questions:

1. Are you cleaning the car?

2. Am I looking at the correct page?

3. Is the dog eating its dinner?

Present simple and continuous: (read, have, interview, watch, write, work, be)

1. Ben <u>reads</u> a book after lunch every day.

2. We <u>are working </u>at a club for three weeks in the holidays.

3. Cathy <u>watches </u>all the soap operas on TV.

4.Mick <u>has</u> a stressful lifestyle, he<u> is </u>a police officer.

5.I <u>am writing</u> a book about London. I am <u>interviewing</u> some businessman at the moment.

Explanation:

We use the present continuous to talk about a thing that is happening or that we are doing at the moment, to talk about plans and temporary situations.

To write affirmative sentences:

He, she, it + is+ verb with ing. For example, he is cooking.

We, you, they, you + are+ verb with ing. For example, you are watching a film.

I + am+ verb with ing. For example, I am running.

To make negative sentences:

He, she, it+ is not /isn't+ verb with ing. For example, He isn't cooking at the moment.

We, you, they, you+ are not/ aren't + verb with ing. For example, you aren't watching a film.

I+ am not+ verb with ing. For example, I am not running.

If we want to make questions, we write first the auxiliary verb and then the subject and the verb with ing. For example, Are you watching the show? , or is she cooking?

We use the present simple to talk about habits, general truths, and to express emotions.

To make affirmative sentences:

He, she it+ verb with s. For example, He drives to school every morning.

We, you, they, you+ verb without s. For example, they go to the bar every Saturday.

I + verb without s. For example, I love pasta.

To make negative sentences:

He, she it+ does not /doesn't + verb without s. For example, She doesn't drive to school every morning.

We, you, they, you, i+ do not/ don't+ verb without s. For example, We don't go to the bar every Saturday.

To make questions we write first the auxiliary does or do, depending on the subject, the subject and the verb without s. For example, do you like pizza? or does he eat lunch?

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